Abstract
The selected physicochemical properties of urea-formaldehyde bonded experimental panels which produced with two mineral adducts (dolomite and olivine) as proportion in Calabrian pine wood chips were evaluated. It appears each mineral adducts improve the surface discoloration changes rather than control samples. The highest lightness change (darker surface) was found with control (∆L:-13.13). However, only a sample of PY1 shows greener color surface (∆a: -0,39) while others show less red color properties (∆a: 1.06 to 3.40 for dolomite-based panels and ∆a: 0.80 to 1.49 for olivine-based panels) than control (PX0/PY0: 3.55). It has been found that the lowest discoloration (improvement) was found to be PX1 sample which is approximately 63% lower than the control (∆E PX0: 13.62, ∆E PX1: 5.03) for dolomite-formulated boards. For olivine-formulated boards that the lowest discoloration was found with sample PY2 which shows approximately 87% lower than the control (∆E PY0: 13.62, ∆E PY2: 1.73). Olivine appears to be more effective for preservation against discoloration from outdoor exposure at similar experimental conditions than dolomite. Although experimental panels show some level lower heat conduction which improves insulation properties, all dolomite- and olivine-based panel’s conduction values were found to be higher than the standard value of λ: 0.065 W/mK. The adducts formulated panels have shown lowering mass loss (%) in burning tests which was found to be in the range of 11.98% (PX1) to 17.39% (PX0) for dolomite-based panels and in the range of 10.85% (PY5) to 17.35% (PY0) for olivine-based panels. It is noticeable that olivine-based panels show lower mass loss against heat than dolomite-based panels at similar experimental conditions. It is also found that dolomite and olivine improve the combustion properties of experimental panels to a certain extent.
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